Which of the following dienes would react fastest in a Diels-Alder reaction? 
Definitions:
New Stimulus
An unfamiliar or novel trigger in the environment that has the potential to elicit a response from a person or an animal.
Hertz
A unit of frequency in the International System of Units (SI), symbolized as Hz, denoting one cycle per second.
Salivate
The production and release of saliva from the salivary glands in the mouth, often in response to the sight, smell, or taste of food.
Conditioned
The process by which an organism learns to associate two stimuli, leading to changes in behavior.
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